linux-kernel - [PATCH v1 07/30] powerpc/vdso: Remove unnecessary ifdefs in vdso

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Message-Id: <f9333432e329b1fcbbbf846cb1cd4a1c4127a60b.1601197618.git.christophe.leroy@csgroup.eu>
Date:   Sun, 27 Sep 2020 09:16:24 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v1 07/30] powerpc/vdso: Remove unnecessary ifdefs in
 vdso_pagelist initialization

No need of all those #ifdefs around the pagelist initialisation,
use IS_ENABLED(), GCC will kick out unused static variables.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/kernel/vdso.c | 31 ++++++-------------------------
 1 file changed, 6 insertions(+), 25 deletions(-)

diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index d129d7ee006d..a24f6a583fac 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -53,15 +53,12 @@ static struct page **vdso32_pagelist;
 unsigned long vdso32_sigtramp;
 unsigned long vdso32_rt_sigtramp;
 
-#ifdef CONFIG_VDSO32
 extern char vdso32_start, vdso32_end;
-#endif
-
-#ifdef CONFIG_PPC64
 extern char vdso64_start, vdso64_end;
 static void *vdso64_kbase = &vdso64_start;
 static unsigned int vdso64_pages;
 static struct page **vdso64_pagelist;
+#ifdef CONFIG_PPC64
 unsigned long vdso64_rt_sigtramp;
 #endif /* CONFIG_PPC64 */
 
@@ -136,7 +133,6 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 	if (!vdso_ready)
 		return 0;
 
-#ifdef CONFIG_PPC64
 	if (is_32bit_task()) {
 		vdso_pagelist = vdso32_pagelist;
 		vdso_pages = vdso32_pages;
@@ -151,11 +147,6 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 		 */
 		vdso_base = 0;
 	}
-#else
-	vdso_pagelist = vdso32_pagelist;
-	vdso_pages = vdso32_pages;
-	vdso_base = VDSO32_MBASE;
-#endif
 
 	current->mm->context.vdso_base = 0;
 
@@ -614,9 +605,7 @@ static __init int vdso_setup(void)
 	struct lib64_elfinfo	v64;
 
 	v32.hdr = vdso32_kbase;
-#ifdef CONFIG_PPC64
 	v64.hdr = vdso64_kbase;
-#endif
 	if (vdso_do_find_sections(&v32, &v64))
 		return -1;
 
@@ -722,16 +711,14 @@ static int __init vdso_init(void)
 	vdso_data->icache_block_size = ppc64_caches.l1i.block_size;
 	vdso_data->dcache_log_block_size = ppc64_caches.l1d.log_block_size;
 	vdso_data->icache_log_block_size = ppc64_caches.l1i.log_block_size;
+#endif /* CONFIG_PPC64 */
 
 	/*
 	 * Calculate the size of the 64 bits vDSO
 	 */
 	vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
 	DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages);
-#endif /* CONFIG_PPC64 */
-
 
-#ifdef CONFIG_VDSO32
 	vdso32_kbase = &vdso32_start;
 
 	/*
@@ -739,8 +726,6 @@ static int __init vdso_init(void)
 	 */
 	vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
 	DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages);
-#endif
-
 
 	vdso_setup_syscall_map();
 
@@ -751,19 +736,15 @@ static int __init vdso_init(void)
 	if (vdso_setup()) {
 		printk(KERN_ERR "vDSO setup failure, not enabled !\n");
 		vdso32_pages = 0;
-#ifdef CONFIG_PPC64
 		vdso64_pages = 0;
-#endif
 		return 0;
 	}
 
-#ifdef CONFIG_VDSO32
-	vdso32_pagelist = vdso_setup_pages(&vdso32_start, &vdso32_end);
-#endif
+	if (IS_ENABLED(CONFIG_VDSO32))
+		vdso32_pagelist = vdso_setup_pages(&vdso32_start, &vdso32_end);
 
-#ifdef CONFIG_PPC64
-	vdso64_pagelist = vdso_setup_pages(&vdso64_start, &vdso64_end);
-#endif /* CONFIG_PPC64 */
+	if (IS_ENABLED(CONFIG_PPC64))
+		vdso64_pagelist = vdso_setup_pages(&vdso64_start, &vdso64_end);
 
 	smp_wmb();
 	vdso_ready = 1;
-- 
2.25.0