netdev - [PATCH] net/chelsio/libcxgb: Add __percpu annotations to libcxgb

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Message-ID: <20240730125856.7321-1-ubizjak@gmail.com>
Date: Tue, 30 Jul 2024 14:58:19 +0200
From: Uros Bizjak <ubizjak@...il.com>
To: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Uros Bizjak <ubizjak@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH] net/chelsio/libcxgb: Add __percpu annotations to libcxgb_ppm.c

Compiling libcxgb_ppm.c results in several sparse warnings:

libcxgb_ppm.c:368:15: warning: incorrect type in assignment (different address spaces)
libcxgb_ppm.c:368:15:    expected struct cxgbi_ppm_pool *pools
libcxgb_ppm.c:368:15:    got void [noderef] __percpu *_res
libcxgb_ppm.c:374:48: warning: incorrect type in initializer (different address spaces)
libcxgb_ppm.c:374:48:    expected void const [noderef] __percpu *__vpp_verify
libcxgb_ppm.c:374:48:    got struct cxgbi_ppm_pool *
libcxgb_ppm.c:484:19: warning: incorrect type in assignment (different address spaces)
libcxgb_ppm.c:484:19:    expected struct cxgbi_ppm_pool [noderef] __percpu *pool
libcxgb_ppm.c:484:19:    got struct cxgbi_ppm_pool *[assigned] pool
libcxgb_ppm.c:511:21: warning: incorrect type in argument 1 (different address spaces)
libcxgb_ppm.c:511:21:    expected void [noderef] __percpu *__pdata
libcxgb_ppm.c:511:21:    got struct cxgbi_ppm_pool *[assigned] pool

Add __percpu annotation to *pools and *pool percpu pointers and to
ppm_alloc_cpu_pool() function that returns percpu pointer to fix
these warnings.

Compile tested only, but there is no difference in the resulting object file.

Signed-off-by: Uros Bizjak <ubizjak@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
---
 drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.c b/drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.c
index 854d87e1125c..01d776113500 100644
--- a/drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.c
+++ b/drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.c
@@ -342,10 +342,10 @@ int cxgbi_ppm_release(struct cxgbi_ppm *ppm)
 }
 EXPORT_SYMBOL(cxgbi_ppm_release);
 
-static struct cxgbi_ppm_pool *ppm_alloc_cpu_pool(unsigned int *total,
-						 unsigned int *pcpu_ppmax)
+static struct cxgbi_ppm_pool __percpu *ppm_alloc_cpu_pool(unsigned int *total,
+							  unsigned int *pcpu_ppmax)
 {
-	struct cxgbi_ppm_pool *pools;
+	struct cxgbi_ppm_pool __percpu *pools;
 	unsigned int ppmax = (*total) / num_possible_cpus();
 	unsigned int max = (PCPU_MIN_UNIT_SIZE - sizeof(*pools)) << 3;
 	unsigned int bmap;
@@ -392,7 +392,7 @@ int cxgbi_ppm_init(void **ppm_pp, struct net_device *ndev,
 		   unsigned int iscsi_edram_size)
 {
 	struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
-	struct cxgbi_ppm_pool *pool = NULL;
+	struct cxgbi_ppm_pool __percpu *pool = NULL;
 	unsigned int pool_index_max = 0;
 	unsigned int ppmax_pool = 0;
 	unsigned int ppod_bmap_size;
-- 
2.45.2