* [PATCH] crypto: arm/chacha - fix build failured when kernel mode NEON is disabled
@ 2020-01-17 16:43 Ard Biesheuvel
2020-01-22 10:16 ` Herbert Xu
0 siblings, 1 reply; 2+ messages in thread
From: Ard Biesheuvel @ 2020-01-17 16:43 UTC (permalink / raw)
To: linux-arm-kernel
Cc: Ard Biesheuvel, Russell King, linux-crypto, Arnd Bergmann, herbert
When the ARM accelerated ChaCha driver is built as part of a configuration
that has kernel mode NEON disabled, we expect the compiler to propagate
the build time constant expression IS_ENABLED(CONFIG_KERNEL_MODE_NEON) in
a way that eliminates all the cross-object references to the actual NEON
routines, which allows the chacha-neon-core.o object to be omitted from
the build entirely.
Unfortunately, this fails to work as expected in some cases, and we may
end up with a build error such as
chacha-glue.c:(.text+0xc0): undefined reference to `chacha_4block_xor_neon'
caused by the fact that chacha_doneon() has not been eliminated from the
object code, even though it will never be called in practice.
Let's fix this by adding some IS_ENABLED(CONFIG_KERNEL_MODE_NEON) tests
that are not strictly needed from a logical point of view, but should
help the compiler infer that the NEON code paths are unreachable in
those cases.
Fixes: b36d8c09e710c71f ("crypto: arm/chacha - remove dependency on generic ...")
Reported-by: Russell King <linux@armlinux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
arch/arm/crypto/chacha-glue.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/crypto/chacha-glue.c b/arch/arm/crypto/chacha-glue.c
index 6ebbb2b241d2..6fdb0ac62b3d 100644
--- a/arch/arm/crypto/chacha-glue.c
+++ b/arch/arm/crypto/chacha-glue.c
@@ -115,7 +115,7 @@ static int chacha_stream_xor(struct skcipher_request *req,
if (nbytes < walk.total)
nbytes = round_down(nbytes, walk.stride);
- if (!neon) {
+ if (!IS_ENABLED(CONFIG_KERNEL_MODE_NEON) || !neon) {
chacha_doarm(walk.dst.virt.addr, walk.src.virt.addr,
nbytes, state, ctx->nrounds);
state[12] += DIV_ROUND_UP(nbytes, CHACHA_BLOCK_SIZE);
@@ -159,7 +159,7 @@ static int do_xchacha(struct skcipher_request *req, bool neon)
chacha_init_generic(state, ctx->key, req->iv);
- if (!neon) {
+ if (!IS_ENABLED(CONFIG_KERNEL_MODE_NEON) || !neon) {
hchacha_block_arm(state, subctx.key, ctx->nrounds);
} else {
kernel_neon_begin();
--
2.20.1
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^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] crypto: arm/chacha - fix build failured when kernel mode NEON is disabled
2020-01-17 16:43 [PATCH] crypto: arm/chacha - fix build failured when kernel mode NEON is disabled Ard Biesheuvel
@ 2020-01-22 10:16 ` Herbert Xu
0 siblings, 0 replies; 2+ messages in thread
From: Herbert Xu @ 2020-01-22 10:16 UTC (permalink / raw)
To: Ard Biesheuvel
Cc: Arnd Bergmann, linux-crypto, linux-arm-kernel, Russell King
On Fri, Jan 17, 2020 at 05:43:18PM +0100, Ard Biesheuvel wrote:
> When the ARM accelerated ChaCha driver is built as part of a configuration
> that has kernel mode NEON disabled, we expect the compiler to propagate
> the build time constant expression IS_ENABLED(CONFIG_KERNEL_MODE_NEON) in
> a way that eliminates all the cross-object references to the actual NEON
> routines, which allows the chacha-neon-core.o object to be omitted from
> the build entirely.
>
> Unfortunately, this fails to work as expected in some cases, and we may
> end up with a build error such as
>
> chacha-glue.c:(.text+0xc0): undefined reference to `chacha_4block_xor_neon'
>
> caused by the fact that chacha_doneon() has not been eliminated from the
> object code, even though it will never be called in practice.
>
> Let's fix this by adding some IS_ENABLED(CONFIG_KERNEL_MODE_NEON) tests
> that are not strictly needed from a logical point of view, but should
> help the compiler infer that the NEON code paths are unreachable in
> those cases.
>
> Fixes: b36d8c09e710c71f ("crypto: arm/chacha - remove dependency on generic ...")
> Reported-by: Russell King <linux@armlinux.org.uk>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
> ---
> arch/arm/crypto/chacha-glue.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
Patch applied. Thanks.
--
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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