linux-kernel - [PATCH v2 4/7] sparc32: Do not select ZONE

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Date: Sat, 24 Feb 2024 18:42:25 +0100
From: Sam Ravnborg via B4 Relay <devnull+sam.ravnborg.org@...nel.org>
To: "Maciej W. Rozycki" <macro@...am.me.uk>, sparclinux@...r.kernel.org, 
 Andreas Larsson <andreas@...sler.com>, Randy Dunlap <rdunlap@...radead.org>
Cc: Miquel Raynal <miquel.raynal@...tlin.com>, 
 linux-parport@...ts.infradead.org, "David S. Miller" <davem@...emloft.net>, 
 Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org, 
 Sam Ravnborg <sam@...nborg.org>
Subject: [PATCH v2 4/7] sparc32: Do not select ZONE_DMA

From: Sam Ravnborg <sam@...nborg.org>

sparc32 has no limited DMA zone so there is no need to select ZONE_DMA.

Based on analysis from Marciej:
"
    Actually I think ZONE_DMA should go too (it's linked to GENERIC_ISA_DMA,
    isn't it? -- cf. commit 5ac6da669e24 ("[PATCH] Set CONFIG_ZONE_DMA for
    arches with GENERIC_ISA_DMA")), and the whole thing use:

    Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")

    The GENERIC_ISA_DMA option itself was added to arch/sparc/config.in with
    2.5.31 as:

        define_bool CONFIG_GENERIC_ISA_DMA y

    despite of:

        define_bool CONFIG_ISA n
"

The sparc32 code did not differ between ZONE_NORMAL and ZONE_DMA,
which confirms the above. This patch drop ZONE_DMA.

Signed-off-by: Sam Ravnborg <sam@...nborg.org>
Reported-by: "Maciej W. Rozycki" <macro@...am.me.uk>
Cc: Andreas Larsson <andreas@...sler.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Randy Dunlap <rdunlap@...radead.org>
Cc: Maciej W. Rozycki <macro@...am.me.uk>
Cc: Arnd Bergmann <arnd@...db.de>
---
 arch/sparc/Kconfig    | 1 -
 arch/sparc/mm/srmmu.c | 1 -
 2 files changed, 2 deletions(-)

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 734f23daecca..bdbde506c01e 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -62,7 +62,6 @@ config SPARC32
 	select HAVE_UID16
 	select LOCK_MM_AND_FIND_VMA
 	select OLD_SIGACTION
-	select ZONE_DMA

 config SPARC64
 	def_bool 64BIT
diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
index 852085ada368..7aae2f6f4973 100644
--- a/arch/sparc/mm/srmmu.c
+++ b/arch/sparc/mm/srmmu.c
@@ -975,7 +975,6 @@ void __init srmmu_paging_init(void)
 	{
 		unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };

-		max_zone_pfn[ZONE_DMA] = max_low_pfn;
 		max_zone_pfn[ZONE_NORMAL] = max_low_pfn;
 		max_zone_pfn[ZONE_HIGHMEM] = highend_pfn;

-- 
2.34.1