linux-kernel - [PATCH 4/9] MIPS: MT: Remove "weak" from vpe

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Message-ID: <20150712231120.11177.53145.stgit@bhelgaas-glaptop2.roam.corp.google.com>
Date:	Sun, 12 Jul 2015 18:11:20 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	Andrew Bresticker <abrestic@...omium.org>,
	linux-mips@...ux-mips.org, James Hogan <james.hogan@...tec.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/9] MIPS: MT: Remove "weak" from vpe_run() declaration

Weak header file declarations are error-prone because they make every
definition weak, and the linker chooses one based on link order (see
10629d711ed7 ("PCI: Remove __weak annotation from pcibios_get_phb_of_node
decl")).

That's not a problem for vpe_run() because Kconfig ensures there's never
more than one definition:

  - vpe_run() is defined in arch/mips/kernel/vpe-mt.c if
    CONFIG_MIPS_VPE_LOADER_MT=y

  - vpe_run() is defined in arch/mips/mti-malta/malta-amon.c if
    CONFIG_MIPS_CMP=y

  - CONFIG_MIPS_VPE_LOADER_MT cannot be set if CONFIG_MIPS_CMP=y

But it's simpler to verify correctness if we remove "weak" from the picture
and test the config symbols directly.

Remove "weak" from the vpe_run() declaration and use #if to test whether a
definition should be present.

Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
 arch/mips/include/asm/vpe.h |    2 +-
 arch/mips/kernel/vpe.c      |   10 +++++-----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/mips/include/asm/vpe.h b/arch/mips/include/asm/vpe.h
index 7849f39..80e70db 100644
--- a/arch/mips/include/asm/vpe.h
+++ b/arch/mips/include/asm/vpe.h
@@ -122,7 +122,7 @@ void release_vpe(struct vpe *v);
 void *alloc_progmem(unsigned long len);
 void release_progmem(void *ptr);
 
-int __weak vpe_run(struct vpe *v);
+int vpe_run(struct vpe *v);
 void cleanup_tc(struct tc *tc);
 
 int __init vpe_module_init(void);
diff --git a/arch/mips/kernel/vpe.c b/arch/mips/kernel/vpe.c
index 72cae9f..04539d6 100644
--- a/arch/mips/kernel/vpe.c
+++ b/arch/mips/kernel/vpe.c
@@ -817,15 +817,11 @@ static int vpe_open(struct inode *inode, struct file *filp)
 
 static int vpe_release(struct inode *inode, struct file *filp)
 {
+#if defined(CONFIG_MIPS_VPE_LOADER_MT) || defined(CONFIG_MIPS_CMP)
 	struct vpe *v;
 	Elf_Ehdr *hdr;
 	int ret = 0;
 
-	if (!vpe_run) {
-		pr_warn("VPE loader: ELF load failed.\n");
-		return -ENOEXEC;
-	}
-
 	v = get_vpe(aprp_cpu_index());
 	if (v == NULL)
 		return -ENODEV;
@@ -855,6 +851,10 @@ static int vpe_release(struct inode *inode, struct file *filp)
 	v->plen = 0;
 
 	return ret;
+#else
+	pr_warn("VPE loader: ELF load failed.\n");
+	return -ENOEXEC;
+#endif
 }
 
 static ssize_t vpe_write(struct file *file, const char __user *buffer,

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