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arm64: barrier: Remove spec_bar() macro

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The spec_bar() macro was introduced in
commit bd4fb6d270 ("arm64: Add support for SB barrier and patch in over DSB; ISB sequences")
as a way for C to insert a speculation barrier and was then
used in one single place: set_fs().

Later on
commit 3d2403fd10 ("arm64: uaccess: remove set_fs()")
deleted set_fs() altogether and as noted in the commit
on the new path the regular sb() assembly macro will
be used.

Delete the remnant.

Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20210325141304.1607595-1-linus.walleij@linaro.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Linus Walleij 2021-03-25 15:13:04 +01:00 • committed by Catalin Marinas
parent 9eef29d8c3
commit 4f30ba1cce
1 changed files with 0 additions and 4 deletions
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4
arch/arm64/include/asm/barrier.h
View file

@ -25,10 +25,6 @@
#define psb_csync() asm volatile("hint #17" : : : "memory")
#define csdb() asm volatile("hint #20" : : : "memory")
#define spec_bar() asm volatile(ALTERNATIVE("dsb nsh\nisb\n", \
SB_BARRIER_INSN"nop\n", \
ARM64_HAS_SB))
#ifdef CONFIG_ARM64_PSEUDO_NMI
#define pmr_sync() \
do { \