Re: [tip:x86/urgent] x86: fix set_fixmap to use phys_addr_t

Mathieu Desnoyers
2009-04-10T16:06:09Z

* Masami Hiramatsu (mhiramat@redhat.com) wrote:
> Masami Hiramatsu wrote:
> > Commit-ID: 189cdc2b41fce3a780a6f3aa963cc4e8114aec6b
> > Gitweb: http://git.kernel.org/tip/189cdc2b41fce3a780a6f3aa963cc4e8114aec6b
> > Author: Masami Hiramatsu <mhiramat@redhat.com>
> > AuthorDate: Thu, 9 Apr 2009 10:55:33 -0700
> > Committer: Ingo Molnar <mingo@elte.hu>
> > CommitDate: Fri, 10 Apr 2009 15:52:59 +0200
> >
> > x86: fix set_fixmap to use phys_addr_t
> >
> > Impact: fix kprobes crash on 32-bit with RAM above 4G
> >
> > Use phys_addr_t for receiving a physical address argument
> > instead of unsigned long. This allows fixmap to handle
> > pages higher than 4GB on x86-32.
> >
> > Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
> > Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
>
> I thought I had to update ioremap.c too...
> Anyway, here is the ioremap.c update. If you think it is useful,
> please merge it.
>
> Thank you,
> ----
>
> x86: fix early_ioremap and early_set_fixmap to handle over 4G pages
>
> From: Masami Hiramatsu <mhiramat@redhat.com>
>
> Impact: Allow early_ioremap to handle over 4G pages
>
> Use phys_addr_t and resource_size_t for receiving a physical
> address argument instead of unsigned long in early_set_fixmap
> and early_ioremap. This allows early_ioremap to handle
> pages higher than 4GB on x86-32 with PAE.
>
> Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
> Cc: Ingo Molnar <mingo@elte.hu>
> ---
>
> arch/x86/include/asm/io.h | 6 ++++--
> arch/x86/mm/ioremap.c | 23 +++++++++++++----------
> 2 files changed, 17 insertions(+), 12 deletions(-)
>
>
> diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
> index e5383e3..7373932 100644
> --- a/arch/x86/include/asm/io.h
> +++ b/arch/x86/include/asm/io.h
> @@ -193,8 +193,10 @@ extern void __iomem *ioremap_wc(resource_size_t offset, unsigned long size);
> */
> extern void early_ioremap_init(void);
> extern void early_ioremap_reset(void);
> -extern void __iomem *early_ioremap(unsigned long offset, unsigned long size);
> -extern void __iomem *early_memremap(unsigned long offset, unsigned long size);
> +extern void __iomem *early_ioremap(resource_size_t phys_addr,
> + unsigned long size);
> +extern void __iomem *early_memremap(resource_size_t phys_addr,
> + unsigned long size);

Nitpick : those second lines are not aligned with each other. The rest
has my

Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>

Thanks !

Mathieu

> extern void early_iounmap(void __iomem *addr, unsigned long size);
>
> #define IO_SPACE_LIMIT 0xffff
> diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
> index 0dfa09d..09daebf 100644
> --- a/arch/x86/mm/ioremap.c
> +++ b/arch/x86/mm/ioremap.c
> @@ -547,7 +547,7 @@ void __init early_ioremap_reset(void)
> }
>
> static void __init __early_set_fixmap(enum fixed_addresses idx,
> - unsigned long phys, pgprot_t flags)
> + phys_addr_t phys, pgprot_t flags)
> {
> unsigned long addr = __fix_to_virt(idx);
> pte_t *pte;
> @@ -566,7 +566,7 @@ static void __init __early_set_fixmap(enum fixed_addresses idx,
> }
>
> static inline void __init early_set_fixmap(enum fixed_addresses idx,
> - unsigned long phys, pgprot_t prot)
> + phys_addr_t phys, pgprot_t prot)
> {
> if (after_paging_init)
> __set_fixmap(idx, phys, prot);
> @@ -607,9 +607,10 @@ static int __init check_early_ioremap_leak(void)
> late_initcall(check_early_ioremap_leak);
>
> static void __init __iomem *
> -__early_ioremap(unsigned long phys_addr, unsigned long size, pgprot_t prot)
> +__early_ioremap(resource_size_t phys_addr, unsigned long size, pgprot_t prot)
> {
> - unsigned long offset, last_addr;
> + unsigned long offset;
> + resource_size_t last_addr;
> unsigned int nrpages;
> enum fixed_addresses idx0, idx;
> int i, slot;
> @@ -625,15 +626,15 @@ __early_ioremap(unsigned long phys_addr, unsigned long size, pgprot_t prot)
> }
>
> if (slot < 0) {
> - printk(KERN_INFO "early_iomap(%08lx, %08lx) not found slot\n",
> - phys_addr, size);
> + printk(KERN_INFO "early_iomap(%08llx, %08lx) not found slot\n",
> + (u64)phys_addr, size);
> WARN_ON(1);
> return NULL;
> }
>
> if (early_ioremap_debug) {
> - printk(KERN_INFO "early_ioremap(%08lx, %08lx) [%d] => ",
> - phys_addr, size, slot);
> + printk(KERN_INFO "early_ioremap(%08llx, %08lx) [%d] => ",
> + (u64)phys_addr, size, slot);
> dump_stack();
> }
>
> @@ -680,13 +681,15 @@ __early_ioremap(unsigned long phys_addr, unsigned long size, pgprot_t prot)
> }
>
> /* Remap an IO device */
> -void __init __iomem *early_ioremap(unsigned long phys_addr, unsigned long size)
> +void __init __iomem *
> +early_ioremap(resource_size_t phys_addr, unsigned long size)
> {
> return __early_ioremap(phys_addr, size, PAGE_KERNEL_IO);
> }
>
> /* Remap memory */
> -void __init __iomem *early_memremap(unsigned long phys_addr, unsigned long size)
> +void __init __iomem *
> +early_memremap(resource_size_t phys_addr, unsigned long size)
> {
> return __early_ioremap(phys_addr, size, PAGE_KERNEL);
> }
> --
> Masami Hiramatsu
>
> Software Engineer
> Hitachi Computer Products (America) Inc.
> Software Solutions Division
>
> e-mail: mhiramat@redhat.com
>

--
Mathieu Desnoyers
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