linux-kernel - [PATCH v1 1/1] dm table: Fix W=1 build warning when mempool_needs

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Message-ID: <20250407072126.3879086-1-andriy.shevchenko@linux.intel.com>
Date: Mon,  7 Apr 2025 10:21:26 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Jens Axboe <axboe@...nel.dk>,
	dm-devel@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev
Cc: Alasdair Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...nel.org>,
	Mikulas Patocka <mpatocka@...hat.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 1/1] dm table: Fix W=1 build warning when mempool_needs_integrity is unused

The mempool_needs_integrity is unused. This, in particular, prevents
kernel builds with Clang, `make W=1` and CONFIG_WERROR=y:

drivers/md/dm-table.c:1052:7: error: variable 'mempool_needs_integrity' set but not used [-Werror,-Wunused-but-set-variable]
 1052 |         bool mempool_needs_integrity = t->integrity_supported;
      |              ^

Fix this by removing the leftover.

Fixes: 105ca2a2c2ff ("block: split struct bio_integrity_payload")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/md/dm-table.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 35100a435c88..53759dbbe9d6 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1049,7 +1049,6 @@ static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *
 	unsigned int min_pool_size = 0, pool_size;
 	struct dm_md_mempools *pools;
 	unsigned int bioset_flags = 0;
-	bool mempool_needs_integrity = t->integrity_supported;
 
 	if (unlikely(type == DM_TYPE_NONE)) {
 		DMERR("no table type is set, can't allocate mempools");
@@ -1074,8 +1073,6 @@ static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *
 
 		per_io_data_size = max(per_io_data_size, ti->per_io_data_size);
 		min_pool_size = max(min_pool_size, ti->num_flush_bios);
-
-		mempool_needs_integrity |= ti->mempool_needs_integrity;
 	}
 	pool_size = max(dm_get_reserved_bio_based_ios(), min_pool_size);
 	front_pad = roundup(per_io_data_size,
-- 
2.47.2