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selftests/x86/fsgsbase: Add a missing memory constraint 

The manual call to set_thread_area() via int $0x80 was missing any
indication that the descriptor was a pointer, causing gcc to
occasionally generate wrong code.  Add the missing constraint.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/432968af67259ca92d68b774a731aff468eae610.1593192140.git.luto@kernel.org
This commit is contained in:
Andy Lutomirski 2020-06-26 10:24:28 -07:00 committed by Thomas Gleixner
parent 979c2c4247
commit 8e259031c6
1 changed files with 2 additions and 1 deletions
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3
tools/testing/selftests/x86/fsgsbase.c
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@ -285,7 +285,8 @@ static unsigned short load_gs(void)
/* 32-bit set_thread_area */
long ret;
asm volatile ("int $0x80"
: "=a" (ret) : "a" (243), "b" (low_desc)
: "=a" (ret), "+m" (*low_desc)
: "a" (243), "b" (low_desc)
: "r8", "r9", "r10", "r11");
memcpy(&desc, low_desc, sizeof(desc));
munmap(low_desc, sizeof(desc));