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Date:   Sun, 15 Jan 2023 09:07:05 -0000
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Subject: [tip: x86/cleanups] x86/signal: Fix the value returned by strict_sas_size()
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        Ingo Molnar <mingo@kernel.org>, x86@kernel.org,
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The following commit has been merged into the x86/cleanups branch of tip:

Commit-ID:     ef6dfc4b238a435ab552207ec09e4a82b6426d31
Gitweb:        https://git.kernel.org/tip/ef6dfc4b238a435ab552207ec09e4a82b6426d31
Author:        Christophe JAILLET <christophe.jaillet@wanadoo.fr>
AuthorDate:    Sat, 14 Jan 2023 18:33:09 +01:00
Committer:     Ingo Molnar <mingo@kernel.org>
CommitterDate: Sun, 15 Jan 2023 09:54:27 +01:00

x86/signal: Fix the value returned by strict_sas_size()

Functions used with __setup() return 1 when the argument has been
successfully parsed.

Reverse the returned value so that 1 is returned when kstrtobool() is
successful (i.e. returns 0).

My understanding of these __setup() functions is that returning 1 or 0
does not change much anyway - so this is more of a cleanup than a
functional fix.

I spot it and found it spurious while looking at something else.
Even if the output is not perfect, you'll get the idea with:

   $ git grep -B2 -A10 retu.*kstrtobool | grep __setup -B10

Fixes: 3aac3ebea08f ("x86/signal: Implement sigaltstack size validation")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/73882d43ebe420c9d8fb82d0560021722b243000.1673717552.git.christophe.jaillet@wanadoo.fr
---
 arch/x86/kernel/signal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 1504eb8..004cb30 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -360,7 +360,7 @@ static bool strict_sigaltstack_size __ro_after_init = false;
 
 static int __init strict_sas_size(char *arg)
 {
-	return kstrtobool(arg, &strict_sigaltstack_size);
+	return kstrtobool(arg, &strict_sigaltstack_size) == 0;
 }
 __setup("strict_sas_size", strict_sas_size);