xtensa: fix kernel register spilling

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commit 77d6273e79 upstream.

call12 can't be safely used as the first call in the inline function,
because the compiler does not extend the stack frame of the bounding
function accordingly, which may result in corruption of local variables.

If a call needs to be done, do call8 first followed by call12.

For pure assembly code in _switch_to increase stack frame size of the
bounding function.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Max Filippov 2015-07-16 10:41:02 +03:00 • committed by Greg Kroah-Hartman

parent 36c2895c6b

commit 3799248733

2 changed files with 21 additions and 12 deletions

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29

arch/xtensa/include/asm/traps.h

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4

arch/xtensa/kernel/entry.S

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