Subject: sparse warnings in string.h
From: Steve French <smfrench@austin.rr.com>
To: linux-kernel@vger.kernel.org
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Message-Id: <1101870601.6580.16.camel@smfhome.smfdom>
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Date: Tue, 30 Nov 2004 21:10:01 -0600
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sparse generates warnings as follows:

 include/asm/string.h:384:26: warning: cast truncates bits from constant
 	value (bdbdbdbd becomes bd)
 include/asm/string.h:387:27: warning: cast truncates bits from constant
 	value (bdbdbdbd becomes bdbd)
 include/asm/string.h:390:27: warning: cast truncates bits from constant
 	value (bdbdbdbd becomes bdbd)
 include/asm/string.h:391:30: warning: cast truncates bits from constant
	value (bdbdbdbd becomes bd)


on two of the cifs vfs C files because of include/asm/string.h due to
the the following case statement in the common include file:

static inline void * __constant_c_and_count_memset(void * s, unsigned
long pattern, size_t count)
{
        switch (count) {
                case 0:
                        return s;
                case 1:
                        *(unsigned char *)s = pattern;
                        return s;
                case 2:
                        *(unsigned short *)s = pattern;
                        return s;
                case 3:
                        *(unsigned short *)s = pattern;
                        *(2+(unsigned char *)s) = pattern;


Any ideas of how to get around these sparse warnings (they are the only
ones that appear in my code)?  I suspect that no one wants to modify
string.h to eliminate the warning because of the comments about compiler
optimization.

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