linux-kernel - [PATCH v1] parisc: pci-dma: remove unused and dead EISA code and comment

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Date:   Wed,  2 Aug 2023 18:33:21 +0200
From:   Petr Tesarik <petrtesarik@...weicloud.com>
To:     "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>, Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-parisc@...r.kernel.org (open list:PARISC ARCHITECTURE),
        linux-kernel@...r.kernel.org (open list)
Cc:     Roberto Sassu <roberto.sassu@...weicloud.com>, petr@...arici.cz
Subject: [PATCH v1] parisc: pci-dma: remove unused and dead EISA code and comment

From: Petr Tesarik <petr.tesarik.ext@...wei.com>

Clearly, this code isn't needed, but it gives a false positive when
grepping the complete source tree for coherent_dma_mask.

Signed-off-by: Petr Tesarik <petr.tesarik.ext@...wei.com>
---
 arch/parisc/kernel/pci-dma.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/arch/parisc/kernel/pci-dma.c b/arch/parisc/kernel/pci-dma.c
index d818ece23b4a..3f6b507970eb 100644
--- a/arch/parisc/kernel/pci-dma.c
+++ b/arch/parisc/kernel/pci-dma.c
@@ -417,14 +417,6 @@ void *arch_dma_alloc(struct device *dev, size_t size,
 	map_uncached_pages(vaddr, size, paddr);
 	*dma_handle = (dma_addr_t) paddr;
 
-#if 0
-/* This probably isn't needed to support EISA cards.
-** ISA cards will certainly only support 24-bit DMA addressing.
-** Not clear if we can, want, or need to support ISA.
-*/
-	if (!dev || *dev->coherent_dma_mask < 0xffffffff)
-		gfp |= GFP_DMA;
-#endif
 	return (void *)vaddr;
 }
 
-- 
2.25.1