3.16.81-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Ard Biesheuvel ard.biesheuvel@linaro.org
commit b660950c60a7278f9d8deb7c32a162031207c758 upstream.
The implementation of macro inv_entry refers to its 'el' argument without the required leading backslash, which results in an undefined symbol 'el' to be passed into the kernel_entry macro rather than the index of the exception level as intended.
This undefined symbol strangely enough does not result in build failures, although it is visible in vmlinux:
$ nm -n vmlinux |head U el 0000000000000000 A _kernel_flags_le_hi32 0000000000000000 A _kernel_offset_le_hi32 0000000000000000 A _kernel_size_le_hi32 000000000000000a A _kernel_flags_le_lo32 .....
However, it does result in incorrect code being generated for invalid exceptions taken from EL0, since the argument check in kernel_entry assumes EL1 if its argument does not equal '0'.
Signed-off-by: Ard Biesheuvel ard.biesheuvel@linaro.org Signed-off-by: Catalin Marinas catalin.marinas@arm.com Cc: Arnd Bergmann arnd@arndb.de Signed-off-by: Ben Hutchings ben@decadent.org.uk --- arch/arm64/kernel/entry.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -187,7 +187,7 @@ END(vectors) * Invalid mode handlers */ .macro inv_entry, el, reason, regsize = 64 - kernel_entry el, \regsize + kernel_entry \el, \regsize mov x0, sp mov x1, #\reason mrs x2, esr_el1