linux-kernel - [PATCH 4.19 01/35] ARM: 9133/1: mm: proc-macros: ensure *_tlb

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Message-Id: <20211101082451.831165264@linuxfoundation.org>
Date:   Mon,  1 Nov 2021 10:17:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Richard Henderson <richard.henderson@...aro.org>
Subject: [PATCH 4.19 01/35] ARM: 9133/1: mm: proc-macros: ensure *_tlb_fns are 4B aligned

From: Nick Desaulniers <ndesaulniers@...gle.com>

commit e6a0c958bdf9b2e1b57501fc9433a461f0a6aadd upstream.

A kernel built with CONFIG_THUMB2_KERNEL=y and using clang as the
assembler could generate non-naturally-aligned v7wbi_tlb_fns which
results in a boot failure. The original commit adding the macro missed
the .align directive on this data.

Link: https://github.com/ClangBuiltLinux/linux/issues/1447
Link: https://lore.kernel.org/all/0699da7b-354f-aecc-a62f-e25693209af4@linaro.org/
Debugged-by: Ard Biesheuvel <ardb@...nel.org>
Debugged-by: Nathan Chancellor <nathan@...nel.org>
Debugged-by: Richard Henderson <richard.henderson@...aro.org>

Fixes: 66a625a88174 ("ARM: mm: proc-macros: Add generic proc/cache/tlb struct definition macros")
Suggested-by: Ard Biesheuvel <ardb@...nel.org>
Acked-by: Ard Biesheuvel <ardb@...nel.org>
Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
Tested-by: Nathan Chancellor <nathan@...nel.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arm/mm/proc-macros.S |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/arm/mm/proc-macros.S
+++ b/arch/arm/mm/proc-macros.S
@@ -342,6 +342,7 @@ ENTRY(\name\()_cache_fns)
 
 .macro define_tlb_functions name:req, flags_up:req, flags_smp
 	.type	\name\()_tlb_fns, #object
+	.align 2
 ENTRY(\name\()_tlb_fns)
 	.long	\name\()_flush_user_tlb_range
 	.long	\name\()_flush_kern_tlb_range