mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-21 06:33:41 +00:00
59 lines
2.3 KiB
Diff
59 lines
2.3 KiB
Diff
|
From 627e2c8313065e627fe5c8c9f82cebd765f5a65e Mon Sep 17 00:00:00 2001
|
||
|
|
From: Ard Biesheuvel <ardb@kernel.org>
|
||
|
|
Date: Fri, 17 Jan 2020 17:43:18 +0100
|
||
|
|
Subject: [PATCH 049/124] crypto: arm/chacha - fix build failured when kernel
|
||
|
|
mode NEON is disabled
|
||
|
|
|
||
|
|
commit 0bc81767c5bd9d005fae1099fb39eb3688370cb1 upstream.
|
||
|
|
|
||
|
|
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>
|
||
|
|
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
|
||
|
|
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
|
||
|
|
---
|
||
|
|
arch/arm/crypto/chacha-glue.c | 4 ++--
|
||
|
|
1 file changed, 2 insertions(+), 2 deletions(-)
|
||
|
|
|
||
|
|
--- a/arch/arm/crypto/chacha-glue.c
|
||
|
|
+++ b/arch/arm/crypto/chacha-glue.c
|
||
|
|
@@ -115,7 +115,7 @@ static int chacha_stream_xor(struct skci
|
||
|
|
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_re
|
||
|
|
|
||
|
|
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();
|