redonkable/alistair23-linux
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lkdtm: mark execute_location as noinline

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The kernel sometimes fails to link when lkdrm is built-in and
compiled with clang:

relocation truncated to fit: R_ARM_THM_CALL against `.bss'

The reason here is that a relocation from .text to .bss fails to
generate a trampoline because .bss is not an executable section.

Marking the function 'noinline' turns the relative branch to .bss
into an absolute branch to the function argument, and that works
fine.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnd Bergmann 2016-02-08 15:34:21 +01:00 committed by Greg Kroah-Hartman
parent c074abe02e
commit ececdc021b
1 changed files with 1 additions and 1 deletions
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2
drivers/misc/lkdtm.c
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@ -335,7 +335,7 @@ static noinline void corrupt_stack(void)
memset((void *)data, 0, 64);
}
static void execute_location(void *dst)
static void noinline execute_location(void *dst)
{
void (*func)(void) = dst;