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22315a2296
linux/arch/arm64
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Nathan Chancellor 22315a2296 arm64: alternatives: Move length validation in alternative_{insn, endif} 
After commit 2decad92f4 ("arm64: mte: Ensure TIF_MTE_ASYNC_FAULT is
set atomically"), LLVM's integrated assembler fails to build entry.S:

<instantiation>:5:7: error: expected assembly-time absolute expression
 .org . - (664b-663b) + (662b-661b)
      ^
<instantiation>:6:7: error: expected assembly-time absolute expression
 .org . - (662b-661b) + (664b-663b)
      ^

The root cause is LLVM's assembler has a one-pass design, meaning it
cannot figure out these instruction lengths when the .org directive is
outside of the subsection that they are in, which was changed by the
.arch_extension directive added in the above commit.

Apply the same fix from commit 966a0acce2 ("arm64/alternatives: move
length validation inside the subsection") to the alternative_endif
macro, shuffling the .org directives so that the length validation
happen will always happen in the same subsections. alternative_insn has
not shown any issue yet but it appears that it could have the same issue
in the future so just preemptively change it.

Fixes: f7b93d4294 ("arm64/alternatives: use subsections for replacement sequences")
Cc: <stable@vger.kernel.org> # 5.8.x
Link: https://github.com/ClangBuiltLinux/linux/issues/1347
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Tested-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/r/20210414000803.662534-1-nathan@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2021-04-15 18:33:25 +01:00
..
boot regulator: Updates for v5.12 2021-02-22 09:16:38 -08:00
configs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid 2021-02-23 14:52:22 -08:00
crypto crypto: arm64/crc-t10dif - move NEON yield to C code 2021-02-10 17:55:58 +11:00
include arm64: alternatives: Move length validation in alternative_{insn, endif} 2021-04-15 18:33:25 +01:00
kernel arm64: kprobes: Restore local irqflag if kprobes is cancelled 2021-04-13 09:30:16 +01:00
kvm arm64/mm: Fix __enable_mmu() for new TGRAN range values 2021-03-10 11:01:57 +00:00
lib arm64: kasan: simplify and inline MTE functions 2021-02-26 09:41:03 -08:00
mm arm64: mm: correct the inside linear map range during hotplug check 2021-03-22 12:47:40 +00:00
net bpf: Rename BPF_XADD and prepare to encode other atomics in .imm 2021-01-14 18:34:29 -08:00
xen
Kbuild
Kconfig arm64: mte: Ensure TIF_MTE_ASYNC_FAULT is set atomically 2021-04-12 13:38:45 +01:00
Kconfig.debug
Kconfig.platforms Updates for the irq subsystem: 2021-02-21 11:53:06 -08:00
Makefile arm64: do not descend to vdso directories twice 2021-01-20 12:18:46 +00:00