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Tue, 10 Nov 2026 18:35:04 -0800 (PST) Received: from ryzen.lan ([2601:644:8000:37f::e34]) by smtp.gmail.com with ESMTPSA id 5614622812f47-56906330dc0sm3873864b6e.16.2026.11.10.18.35.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Nov 2026 18:35:02 -0800 (PST) From: Rosen Penev To: Andrew Morton Cc: linux-kernel@vger.kernel.org Subject: [PATCH] lib/bch: use flexible array member for xi_tab Date: Tue, 10 Nov 2026 18:34:58 -0800 Message-ID: <20261111023458.72092-1-rosenp@gmail.com> X-Mailer: git-send-email 2.56.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Convert xi_tab in struct bch_control from a separately allocated pointer to a flexible array member trailing the struct. This co-locates the xi_tab data with the struct allocation, reducing the number of individual heap allocations and simplifying cleanup. The xi_tab member is moved to the end of the struct and changed from 'unsigned int *' to 'unsigned int []'. The allocation in bch_init() switches from kzalloc_obj + bch_alloc to kzalloc_flex, and the corresponding kfree in bch_free() is removed. Signed-off-by: Rosen Penev --- include/linux/bch.h | 2 +- lib/bch.c | 4 +--- 2 files changed, 2 insertions(+), 4 deletions(-) diff --git a/include/linux/bch.h b/include/linux/bch.h index 85fdce83d4e2..e736b3a46e96 100644 --- a/include/linux/bch.h +++ b/include/linux/bch.h @@ -47,12 +47,12 @@ struct bch_control { uint32_t *mod8_tab; uint32_t *ecc_buf; uint32_t *ecc_buf2; - unsigned int *xi_tab; unsigned int *syn; int *cache; struct gf_poly *elp; struct gf_poly *poly_2t[4]; bool swap_bits; + unsigned int xi_tab[]; }; struct bch_control *bch_init(int m, int t, unsigned int prim_poly, diff --git a/lib/bch.c b/lib/bch.c index c991c71c4cbd..f003965a21b9 100644 --- a/lib/bch.c +++ b/lib/bch.c @@ -1320,7 +1320,7 @@ struct bch_control *bch_init(int m, int t, unsigned int prim_poly, if (prim_poly == 0) prim_poly = prim_poly_tab[m-min_m]; - bch = kzalloc_obj(*bch); + bch = kzalloc_flex(*bch, xi_tab, m); if (bch == NULL) goto fail; @@ -1334,7 +1334,6 @@ struct bch_control *bch_init(int m, int t, unsigned int prim_poly, bch->mod8_tab = bch_alloc(words*1024*sizeof(*bch->mod8_tab), &err); bch->ecc_buf = bch_alloc(words*sizeof(*bch->ecc_buf), &err); bch->ecc_buf2 = bch_alloc(words*sizeof(*bch->ecc_buf2), &err); - bch->xi_tab = bch_alloc(m*sizeof(*bch->xi_tab), &err); bch->syn = bch_alloc(2*t*sizeof(*bch->syn), &err); bch->cache = bch_alloc(2*t*sizeof(*bch->cache), &err); bch->elp = bch_alloc((t+1)*sizeof(struct gf_poly_deg1), &err); @@ -1384,7 +1383,6 @@ void bch_free(struct bch_control *bch) kfree(bch->mod8_tab); kfree(bch->ecc_buf); kfree(bch->ecc_buf2); - kfree(bch->xi_tab); kfree(bch->syn); kfree(bch->cache); kfree(bch->elp); -- 2.56.0