Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <0e2f9ee8-4b4a-4b6a-5dbe-5830778747e7@oracle.com>
Date:   Wed, 14 Jun 2023 06:57:42 -0500
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
 Thunderbird/102.10.0
Subject: Re: [PATCH v1 05/21] arm64/kexec: refactor for kernel/Kconfig.kexec
Content-Language: en-US
To:     "Leizhen (ThunderTown)" <thunder.leizhen@huawei.com>,
        linux@armlinux.org.uk, catalin.marinas@arm.com, will@kernel.org,
        chenhuacai@kernel.org, geert@linux-m68k.org,
        tsbogend@alpha.franken.de, James.Bottomley@HansenPartnership.com,
        deller@gmx.de, ysato@users.sourceforge.jp, dalias@libc.org,
        glaubitz@physik.fu-berlin.de, tglx@linutronix.de, mingo@redhat.com,
        bp@alien8.de, dave.hansen@linux.intel.com,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-ia64@vger.kernel.org, loongarch@lists.linux.dev,
        linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org,
        linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org,
        linux-sh@vger.kernel.org
Cc:     kernel@xen0n.name, mpe@ellerman.id.au, npiggin@gmail.com,
        christophe.leroy@csgroup.eu, paul.walmsley@sifive.com,
        palmer@dabbelt.com, aou@eecs.berkeley.edu, hca@linux.ibm.com,
        gor@linux.ibm.com, agordeev@linux.ibm.com,
        borntraeger@linux.ibm.com, svens@linux.ibm.com, hpa@zytor.com,
        keescook@chromium.org, paulmck@kernel.org, peterz@infradead.org,
        frederic@kernel.org, akpm@linux-foundation.org, ardb@kernel.org,
        samitolvanen@google.com, juerg.haefliger@canonical.com,
        arnd@arndb.de, rmk+kernel@armlinux.org.uk,
        linus.walleij@linaro.org, sebastian.reichel@collabora.com,
        rppt@kernel.org, kirill.shutemov@linux.intel.com,
        anshuman.khandual@arm.com, ziy@nvidia.com, masahiroy@kernel.org,
        ndesaulniers@google.com, mhiramat@kernel.org, ojeda@kernel.org,
        xin3.li@intel.com, tj@kernel.org, gregkh@linuxfoundation.org,
        tsi@tuyoix.net, bhe@redhat.com, hbathini@linux.ibm.com,
        sourabhjain@linux.ibm.com, boris.ostrovsky@oracle.com,
        konrad.wilk@oracle.com
References: <20230612172805.681179-1-eric.devolder@oracle.com>
 <20230612172805.681179-6-eric.devolder@oracle.com>
 <29427d7c-7d81-9bda-0067-d17b51952cb4@huawei.com>
From:   Eric DeVolder <eric.devolder@oracle.com>
In-Reply-To: <29427d7c-7d81-9bda-0067-d17b51952cb4@huawei.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?QTFEbUhJbEhmUG4rS3o4UWZzaXFzS3FHZm02SW9xNXl4bDg4dXByUGlmdGRF?=
 =?utf-8?B?Y0llV1VYLzJ0cmJxM29YdUVZNXMvdWJlT0Vib3QyT1lZNWZWK1RNTGJLcHpQ?=
 =?utf-8?B?bUpBZ1ErY1hVZGlzdEc0ZTdKcEFhRDRzd2NjVlBmYTJTTmh6Uy9TWW9uY2RX?=
 =?utf-8?B?SXlqN1lJOE0yZEhjOHdzYmI1UFZkWXlndDc5UlNqU3lXeStYajdueU1pTlox?=
 =?utf-8?B?QzV2NDJDM29kUzUzZ0VTeGs3UVNCNmJlckZiYkpWNTdmd0grWEF5ZE9nNWRH?=
 =?utf-8?B?bXVHbjBVazJEc2NrRXBQSG93YWZNZUpPQ1dpL2p4NTdFOVVFTnpZWU9lS3No?=
 =?utf-8?B?QURyamllTllldkx4TXhsNzlFdkErSEluODY1VEwySnB3Y0hJbGN3VkJOR1Qy?=
 =?utf-8?B?ekJNS2Y1eHE0c0VJaktaaHo5dGpsbllOZVp6MHdUTDJVMVQ4enJiVEZoSkxK?=
 =?utf-8?B?Z3FGZ081ZDREWVR4MHF0bGRuQjBYQlRXMUlWQ1FVVXJweVo2WXlxVUJvVTBK?=
 =?utf-8?B?VVh5UjhzeGZhSFZBZWpNeXV1QzJWR0w5d3k4eWkrT1REWjdMS3lBY3JDNDVU?=
 =?utf-8?B?LzFjcWhYTFJzb2xESE0vVWFUd2toSThOZTRiWmdTVm42NmdGOHRKakFsM1BW?=
 =?utf-8?B?V1hMQmpwcFJsVzlXN01IdGRJSkpUdTd1ZjB1YXZxOERFNnV0RTB6SlYzZW9V?=
 =?utf-8?B?WFR4LzRaNThUK1ZodFZZZFNPN1JLZGQ1NDJYYThQYzRuVWU3WXgwSlA2UlFH?=
 =?utf-8?B?cGk4cTNyQnlDTzVHY25HcXM1SG8xL252MnJKdHo3S1pTOGZCYkJWSUhBQ3dn?=
 =?utf-8?B?dUNYVGxMMm5uU1hDYmtRYkl6aUFVUFdEWlB0WWd0bVltZTh2SVkySGhMQkdQ?=
 =?utf-8?B?dmVoYklnc2FjbHJBOHRDRmpqYkkvcC9zRk9RQW0rQktuZlFlMGhvT2Y5VVJu?=
 =?utf-8?B?MjFjdFBBQ01xR0tBeC9wWmxtY1dQVFBzamVHMWZRYXpYZUZuUWJ1VnRiTkNk?=
 =?utf-8?B?VEhMV0hsTzJBNkZya1NZMm5kZVovTm9HeU9jWjZGelhNeVFVdVg1WmhwcXcx?=
 =?utf-8?B?d2FxajcxRUZzaUM1TXdid090YzZUc1FXeTJDN2VlRHBTNWV0bk02eXEvSnVR?=
 =?utf-8?B?Z3F1cU03MkFwanF0WFJGeEhuZ25QQUoxaDg4VVkzbWM4Z2VET0c5NElYdTND?=
 =?utf-8?B?N3duc250ZjFyWHFjQ2VQZ2NMdDFSekI5am9WNi92K0gwYi9iOTFpUWZCTCsy?=
 =?utf-8?B?VmhoRWRLL3lDdE1LV3BPUjJHL28wQUZ1ZklXa3R5U0hXRXNPc01TdTVOSWgr?=
 =?utf-8?B?TkI4U3FGNkVBdHQ2WFMvSk1WN3d5czZKRUtWemZZN2JVWkd3LzM2ZDdHa2lS?=
 =?utf-8?B?Sm9sTjBpRllEUVBwOE5vSkZxcWxEaitEY2hydE92Z3E1SmhyMHFRa3lsMExP?=
 =?utf-8?B?ZEdpN0s0SlZSOVk5THVqclVEVCt3dnNvWXF5Ui8xQjI2STUxaEM5WVJ1K0RW?=
 =?utf-8?B?WU5mZk5iVStCWnQ5bGJJS1RBV0dieTVMREJ4eXVPUVZVN0Foa29Cb1VzVm1G?=
 =?utf-8?B?aGR3dmFocUFMTVFoNHNGdGlJWC9mRTh0UUVmam51SlVra2VoOGpGeXNkL3ZQ?=
 =?utf-8?B?VjQwREowMk5xcVZqTHZvUUVOakdTSDV1TjY4RDlEWkRqV24wTW5Rd3pVS29j?=
 =?utf-8?B?OFVoV0xKNk1rRkY5aFJWdm56eFI0TjdLbkx1bEZoL0F1WlpnKzU5ekVhYzlu?=
 =?utf-8?B?WW91UHZJZ3VGQ1MzWDRaRTlMUmdld1BrRnQ4R3MrTnY1N3RuNXFTUWczM0Mv?=
 =?utf-8?B?UUgwMEx0QUhxMms1b0dPcXJvOEFUMENTSWQ5WUdjTXVxNm1EUTJ1ZE5zUWIr?=
 =?utf-8?B?NEIySnl1TURSM3pjaE9kdlBoei96bFdlUlc3UUVFSlY1L0lUdFVNQ1doREdG?=
 =?utf-8?B?bzcrdTFCUEtLR3VYTytVTlRiVTR5bzFqcHRaWnBCajV6Q2xBT01KUWpKcnJN?=
 =?utf-8?B?OVJ3OHh0UzJDNHBSQjRTcEhFSFYxeGZNRlpyYW9EWEV2enBtR2oxcXZ2b2Ra?=
 =?utf-8?B?dDNIbFl4cnR3NjluVDNuTDBpYU1uRkxIeDdXVE9IQzB3K01LbkFLQlp0dE5U?=
 =?utf-8?B?WDV1L0JXN3F0TCtDditZVlJMTlRvVW0zeE9sV1BCenh0U0Qvam0yb3Jra1lW?=
 =?utf-8?B?YkE9PQ==?=
X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 2
X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: =?utf-8?B?Z1Y0OTRQSmIxL3k5Mll4aFUrV3lvOXlpMGZjbXphQnJzT1VTQSt4M0dVVzhC?=
 =?utf-8?B?bGgyanVTNVI4MGVldHJjaWh0b1p0azVoLzVxMWlTRk1OOWZHcXZXM0QvYVFE?=
 =?utf-8?B?UGlXcmhvaVBXNyt0dkdTVTBXR2kxeTBLWW5nalo4dlUvajVuZzIzQ3FpZmdR?=
 =?utf-8?B?OS9PU05zQytNYjdUaHZFNklFQmI1MWdFa0FpL09HNTdiRURabjBkQk95Wks2?=
 =?utf-8?B?blJmandOVXJrZ1lnV3NUVHBsbkhaWG9XQ2sxdjhzSkNZVTg1SFJxcGlINDNB?=
 =?utf-8?B?aTRGdmZKc3dLQnZkUUVFTmdHWlFQaXFxMGhFSnNHNCtGTklEQ0k1MGJ0elpV?=
 =?utf-8?B?bnVjbVAyaklxVCtqVWpZeUhwcC9XdTE5UXp0LysvZVJjeVBjQVZiVGNDUktU?=
 =?utf-8?B?YTV6OHg0S1dQTDg5bW96R3lHUzF1WFBkVG1OTGlZM3BGTnZnOFR4Y0tHYjUv?=
 =?utf-8?B?THRZTEtuRHgzTEFaZUVTVEY4TkhXL2ZrbC9lTFJYUU9USGZsS0RGcTk1SU91?=
 =?utf-8?B?WkJjNWN2NGc4NTN3TnRFRGk1L3ZGNml1NFlpWUZJWlpDMFEzT2ZlRHRjWlRO?=
 =?utf-8?B?ampCS3YwN3MxcjN0QW1QdCtIZStNQ2twOFRvMVpFSEVJYk9TUExyd2JORnpx?=
 =?utf-8?B?QWFLZ2YxdTRjL1RNTjY3VXpta015dFpPYm8zZVZ4aXNWSVltVDlqU3pMckVp?=
 =?utf-8?B?TlRJUDB2dnVmMFhhcitqL016b1E0N1dSM0hzYjkxZUJ0aERoRy9IM1RqRlg3?=
 =?utf-8?B?V1gyZTBVekZ1S2lWSjNMM2N6cGIzRTJOcE1oTWZzbTM5U0NhbFhIbElKMCtr?=
 =?utf-8?B?TW5KQVcxOE1Zb0FSWEJDcW54bWowenVmUDdIbUt5SkZlZnNiSEVqUnRLWW56?=
 =?utf-8?B?eTlZS0NuUnU4WFVMNTlYdUZSbXlpTHl1RlRpNWJiTTROWXlzcXlUMzZYTThY?=
 =?utf-8?B?SXJvNTlIbnU3MTlIcEhLUjV1Wmx4SW5XN2tNcnJDSzNtNmpxemRJOU9qeHU0?=
 =?utf-8?B?Vy8wTEltclJ6Z3lHSjBjWFh0dnVKQjBWL1dYUnNYWlF5czM4VTRVU3IxV2Fi?=
 =?utf-8?B?bWhNZVNmVWVOWDcya0ZPVWtvKzFvZmNHZ0xJTkF6dEhjN3hNYzVrbEV0NHZh?=
 =?utf-8?B?Q1VQNUNPSDBYK2M3S0RpYkp0eVhnZ0NybkZ6bkd2WnMzZ1M2RXlPMDYzRXVk?=
 =?utf-8?B?bStlRWxMZWo1Rm1nbXp2VXFUNFEzaUhGNDdRUDJyMk5lM2k1eFdDeTM4MmlL?=
 =?utf-8?B?ckIybEtDb0RKb1luM0hlUk9oQzZHd0ZpWlRRUmUwYlMzMHZWYnVjMjVmOUxD?=
 =?utf-8?B?UTIxMlp1M243dmwrTXk2QkU1aVBRaU43MWF4RTNCTTdaQmpJYWZUdTJZUmtK?=
 =?utf-8?B?ZmN2REpVZzdZQjYyYThidEhHUjdiekdGaERPM0N3THNTc3NLblVWMC9ocjk4?=
 =?utf-8?B?VnRIbm9XRFluY0N2Z0RxcFF2M3E1Q293TWRnR1pJT1NvUmxUQVJwMVBBWGFN?=
 =?utf-8?B?NEVqbUV4RXRIam9EbnBpN1JBWTVyajRVYUMxSFN2YmR0azdxRlQxVEl0VUtV?=
 =?utf-8?B?SVM3dU9pWjdMdVBFWFhsL2ZoRjg4ZzNNMEVYTUlraHlLUzQzVm9zWTNmd3VB?=
 =?utf-8?B?Y2N3Q1JYcytlTTNwWWhmM2x3bWhwRjd0eU1pdnpieWxVUkR1YTI2bFVCeTVS?=
 =?utf-8?B?UkFmTnNrakxzc0s1QTg1OVNNVDRBYVpOVUdha0lDaURyNkRENTdrTVc1Um15?=
 =?utf-8?B?V2lKUktvN3k0bVFTdGdqVVBDSThWQzVSSGU3dFJzUG9IN1pFZ0UvTEx0RVN3?=
 =?utf-8?B?TlpwcXdXN1habWNYNW85eGxHTnJ0LzcyTzk2ZWN5c0NkeEhTVnNKMTJ1MzVn?=
 =?utf-8?B?Y1Y3dnduOENEVFRNVUFyZ1dMTGZTL0VkS2IwR2JlUEQ2Z1VGbDNNaWZQMGVZ?=
 =?utf-8?B?cEdxaHBidEZXRjErQWZVUld2MXVZLzNlaFgraThtbVk5SEpZdTJVdnczdFR0?=
 =?utf-8?B?bDJ6djVHU1F0ZFVuSWQxenFIL0wrbWtMSm1nT1R4L2hkNDZ1a1FTY1N0WDlM?=
 =?utf-8?B?QkhsSTZyQno3OHFKcHNSQmN2Rno2dWtxcXRmTWVDQW1yd3pYVnpJV2RTSGhx?=
 =?utf-8?B?ZUJINUN2bExScENhRGM4cHB2UlBmNExuSzVxY2lGODJoaE0zN2FzMGpBWXVF?=
 =?utf-8?B?MmJVVklYSnVWdjZrSFdhMjgwWXh5SVg2czNZRjk3NW91ODJmdEd4eHNnYUtj?=
 =?utf-8?B?WVNGTFhUNjE1SmRIY1VMZGF2b2FjYmk2Q1FCOGhUMmJmZVhIQml4YWZMeXZB?=
 =?utf-8?B?eTRXQUwvZ3o0cmg1WkxxTGdOb2pJQnQzb2FHZXQrNUR4UU5ZK01zZGJlYWdC?=
 =?utf-8?Q?jTIKZArGgVtSt8/8jqnhcmKgzaVfGyf5yfJSGCFECn+It?=
X-MS-Exchange-AntiSpam-ExternalHop-MessageData-1: ySbe3JJHRhTKNTBH9WcZv/kqZxAGfjeqfINkm1w1E2TVY2fswl2JWJj2g4+ylfPuCe7qlWbdQhBJw0qQUIXVKIVq0df6nQm8wlM56epcWhOdDFnGFetdOqCqDPamC2OsX7BPU8+bnTUmikMJLcIcI27W0YfvZVAvIApKx7pTL788+WxEadmGhCEyj5iamKxoEDM25MWWdcFkQTDkzSXP1iWJxAMbXpsOhpgoFsJ850xM05qs8fl6ps3m68gqqN4ZW0JpTJwzOKDF8YE1A+ajnMLh6KLhKvfHTGbgeC36CvslPNwiGxJSrE66psdjNmFi8tKyhhcdAehdjH0egZYJjTXWKZ1DCLYifef+9uDTN2eNLyMhZgdWYvvI7Iy47gnDD6U+L0Wqw7zHTeBmXYtmF3Am2Oh/TnJdomXW0z7mPRRNYkQ9xjSLAUFdVc2fZ0vnqNjnihJMDqNyjQ==
X-OriginatorOrg: oracle.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 8f042834-7886-44a6-30e4-08db6cce9462
X-MS-Exchange-CrossTenant-AuthSource: CO1PR10MB4531.namprd10.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jun 2023 11:57:51.3933
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: pzETc2oC2lVCZATjw+ZA2KCmL4MnSyyr7KamSxVPGYoaH70KaDs1iq8UBx8feB0kkFP8ggOgLXew+zOoTDbf0uuHu1SE0eIakRpfeyBEpZ4=
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR10MB7123
X-Proofpoint-Virus-Version: vendor=baseguard
 engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.176.26
 definitions=2023-06-14_08,2023-06-14_01,2023-05-22_02
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 mlxscore=0 phishscore=0
 suspectscore=0 mlxlogscore=999 bulkscore=0 spamscore=0 malwarescore=0
 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000
 definitions=main-2306140103
X-Proofpoint-ORIG-GUID: LPbsoxk9yiE-DL4hUdUU_g6xSleTj6fo
X-Proofpoint-GUID: LPbsoxk9yiE-DL4hUdUU_g6xSleTj6fo
X-Spam-Status: No, score=-2.9 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,NICE_REPLY_A,RCVD_IN_DNSWL_LOW,
        RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE,
        T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no
        version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org


On 6/13/23 20:22, Leizhen (ThunderTown) wrote:
> 
> 
> On 2023/6/13 1:27, Eric DeVolder wrote:
>> The kexec and crash kernel options are provided in the common
>> kernel/Kconfig.kexec. Utilize the common options and provide
>> the ARCH_HAS_ and ARCH_SUPPORTS_ entries to recreate the
>> equivalent set of KEXEC and CRASH options.
>>
>> Signed-off-by: Eric DeVolder <eric.devolder@oracle.com>
>> ---
>>   arch/arm64/Kconfig | 61 ++++++++--------------------------------------
>>   1 file changed, 10 insertions(+), 51 deletions(-)
>>
>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>> index 343e1e1cae10..33552476a877 100644
>> --- a/arch/arm64/Kconfig
>> +++ b/arch/arm64/Kconfig
>> @@ -1433,60 +1433,19 @@ config PARAVIRT_TIME_ACCOUNTING
>>   
>>   	  If in doubt, say N here.
>>   
>> -config KEXEC
>> -	depends on PM_SLEEP_SMP
>> -	select KEXEC_CORE
>> -	bool "kexec system call"
>> -	help
>> -	  kexec is a system call that implements the ability to shutdown your
>> -	  current kernel, and to start another kernel.  It is like a reboot
>> -	  but it is independent of the system firmware.   And like a reboot
>> -	  you can start any kernel with it, not just Linux.
>> -
>> -config KEXEC_FILE
>> -	bool "kexec file based system call"
>> -	select KEXEC_CORE
>> -	select HAVE_IMA_KEXEC if IMA
>> -	help
>> -	  This is new version of kexec system call. This system call is
>> -	  file based and takes file descriptors as system call argument
>> -	  for kernel and initramfs as opposed to list of segments as
>> -	  accepted by previous system call.
>> -
>> -config KEXEC_SIG
>> -	bool "Verify kernel signature during kexec_file_load() syscall"
>> -	depends on KEXEC_FILE
>> -	help
>> -	  Select this option to verify a signature with loaded kernel
>> -	  image. If configured, any attempt of loading a image without
>> -	  valid signature will fail.
>> -
>> -	  In addition to that option, you need to enable signature
>> -	  verification for the corresponding kernel image type being
>> -	  loaded in order for this to work.
>> +config ARCH_HAS_KEXEC
>> +	def_bool PM_SLEEP_SMP
>>   
>> -config KEXEC_IMAGE_VERIFY_SIG
>> -	bool "Enable Image signature verification support"
>> -	default y
>> -	depends on KEXEC_SIG
>> -	depends on EFI && SIGNED_PE_FILE_VERIFICATION
>> -	help
>> -	  Enable Image signature verification support.
> 
> I don't see an alternative to this option. It's used in
> arch/arm64/kernel/kexec_image.c:135
> 
Good catch! I will move this into the common options.
Thank you Zhen!
eric

>> -
>> -comment "Support for PE file signature verification disabled"
>> -	depends on KEXEC_SIG
>> -	depends on !EFI || !SIGNED_PE_FILE_VERIFICATION
>> +config ARCH_HAS_KEXEC_FILE
>> +	def_bool y
>>   
>> -config CRASH_DUMP
>> -	bool "Build kdump crash kernel"
>> -	help
>> -	  Generate crash dump after being started by kexec. This should
>> -	  be normally only set in special crash dump kernels which are
>> -	  loaded in the main kernel with kexec-tools into a specially
>> -	  reserved region and then later executed after a crash by
>> -	  kdump/kexec.
>> +config ARCH_SUPPORTS_KEXEC_FILE
>> +	def_bool y
>> +	depends on KEXEC_FILE
>> +	select HAVE_IMA_KEXEC if IMA
>>   
>> -	  For more details see Documentation/admin-guide/kdump/kdump.rst
>> +config ARCH_HAS_CRASH_DUMP
>> +	def_bool y
>>   
>>   config TRANS_TABLE
>>   	def_bool y
>>
>