Commit e83dd377 authored Aug 06, 2015 by Drew Richardson Committed by Russell King Aug 07, 2015

ARM: 8409/1: Mark ret_fast_syscall as a function



ret_fast_syscall runs when user space makes a syscall. However it
needs to be marked as such so the ELF information is correct. Before
it was:

   101: 8000f300     0 NOTYPE  LOCAL  DEFAULT    2 ret_fast_syscall

But with this change it correctly shows as:

   101: 8000f300    96 FUNC    LOCAL  DEFAULT    2 ret_fast_syscall

I see this function when using perf to unwind call stacks from kernel
space to user space. Without this change I would need to add some
special case logic when using the vmlinux ELF information.

Signed-off-by: Drew Richardson <drew.richardson@arm.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

parent 998ef5d8

arch/arm/kernel/entry-common.S

+1 −0

Original line number	Diff line number	Diff line
		@@ -61,6 +61,7 @@ work_pending:
		movlt scno, #(__NR_restart_syscall - __NR_SYSCALL_BASE)
		ldmia sp, {r0 - r6} @ have to reload r0 - r6
		b local_restart @ ... and off we go
		ENDPROC(ret_fast_syscall)

		/*
		* "slow" syscall return path. "why" tells us if this was a real syscall.