Re: [PATCH] soc/fsl: qbman: fix conflicting alignment attributes
From: Li Yang <hidden>
Date: 2021-03-26 02:18:39
Also in:
linuxppc-dev, lkml
On Tue, Mar 23, 2021 at 8:17 AM Arnd Bergmann [off-list ref] wrote:
quoted hunk ↗ jump to hunk
From: Arnd Bergmann <arnd@arndb.de> When building with W=1, gcc points out that the __packed attribute on struct qm_eqcr_entry conflicts with the 8-byte alignment attribute on struct qm_fd inside it: drivers/soc/fsl/qbman/qman.c:189:1: error: alignment 1 of 'struct qm_eqcr_entry' is less than 8 [-Werror=packed-not-aligned] I assume that the alignment attribute is the correct one, and that qm_eqcr_entry cannot actually be unaligned in memory, so add the same alignment on the outer struct. Fixes: c535e923bb97 ("soc/fsl: Introduce DPAA 1.x QMan device driver") Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- drivers/soc/fsl/qbman/qman.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)diff --git a/drivers/soc/fsl/qbman/qman.c b/drivers/soc/fsl/qbman/qman.c index a1b9be1d105a..fde4edd83c14 100644 --- a/drivers/soc/fsl/qbman/qman.c +++ b/drivers/soc/fsl/qbman/qman.c@@ -186,7 +186,7 @@ struct qm_eqcr_entry { __be32 tag; struct qm_fd fd; u8 __reserved3[32]; -} __packed; +} __packed __aligned(8);
The EQCR structure is actually aligned on 64-byte from the manual. But probably 8 is enough to let the compiler not complain.
#define QM_EQCR_VERB_VBIT 0x80 #define QM_EQCR_VERB_CMD_MASK 0x61 /* but only one value; */ #define QM_EQCR_VERB_CMD_ENQUEUE 0x01 -- 2.29.2
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