From 155c9971fa88a6655431476f024566fcd9ddcdb6 Mon Sep 17 00:00:00 2001 From: Leon Romanovsky Date: Wed, 26 Nov 2025 09:57:37 +0200 Subject: [PATCH] RDMA/bng_re: Remove prefetch instruction The prefetch instruction is meant to speed up access to memory referenced by its address argument. In the bng_re code path, it has no effect, because the pointer refers to a function that is executed immediately afterward. The issue was identified due to the following kbuild compilation error: drivers/infiniband/hw/bng_re/bng_fw.c: In function 'bng_re_creq_irq': drivers/infiniband/hw/bng_re/bng_fw.c:278:9: error: implicit declaration of function 'prefetch' [-Wimplicit-function-declaration] 278 | prefetch(bng_re_get_qe(hwq, sw_cons, NULL)); | ^~~~~~~~ Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202511260607.Kuxn4NnN-lkp@intel.com/ Fixes: 4f830cd8d7fe ("RDMA/bng_re: Add infrastructure for enabling Firmware channel") Link: https://patch.msgid.link/20251126-remove-prefetch-v1-1-fcac22007ea7@nvidia.com Signed-off-by: Leon Romanovsky --- drivers/infiniband/hw/bng_re/bng_fw.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/infiniband/hw/bng_re/bng_fw.c b/drivers/infiniband/hw/bng_re/bng_fw.c index 803610fb9c58..7d9539113cf5 100644 --- a/drivers/infiniband/hw/bng_re/bng_fw.c +++ b/drivers/infiniband/hw/bng_re/bng_fw.c @@ -525,7 +525,7 @@ static irqreturn_t bng_re_creq_irq(int irq, void *dev_instance) hwq = &creq->hwq; /* Prefetch the CREQ element */ sw_cons = HWQ_CMP(hwq->cons, hwq); - prefetch(bng_re_get_qe(hwq, sw_cons, NULL)); + bng_re_get_qe(hwq, sw_cons, NULL); tasklet_schedule(&creq->creq_tasklet); return IRQ_HANDLED; -- 2.47.3