From: Mike Rapoport <rppt@kernel.org>
To: Baoquan He <bhe@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
linux-mm@kvack.org, arnd@arndb.de, christophe.leroy@csgroup.eu,
hch@lst.de, willy@infradead.org, agordeev@linux.ibm.com,
wangkefeng.wang@huawei.com, schnelle@linux.ibm.com,
David.Laight@ACULAB.COM, shorne@gmail.com, deller@gmx.de,
Jonas Bonn <jonas@southpole.se>,
Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
openrisc@lists.librecores.org
Subject: Re: [PATCH v6 03/19] openrisc: mm: remove unneeded early ioremap code
Date: Sun, 11 Jun 2023 08:44:55 +0300 [thread overview]
Message-ID: <20230611054455.GM52412@kernel.org> (raw)
In-Reply-To: <20230609075528.9390-4-bhe@redhat.com>
On Fri, Jun 09, 2023 at 03:55:12PM +0800, Baoquan He wrote:
> Under arch/openrisc, there isn't any place where ioremap() is called.
> It means that there isn't early ioremap handling needed in openrisc,
> So the early ioremap handling code in ioremap() of
> arch/openrisc/mm/ioremap.c is unnecessary and can be removed.
>
> And also remove the special handling in iounmap() since no page
> is got from fixmap pool along with early ioremap code removing
> in ioremap().
>
> Link: https://lore.kernel.org/linux-mm/YwxfxKrTUtAuejKQ@oscomms1/
> Signed-off-by: Baoquan He <bhe@redhat.com>
> Acked-by: Stafford Horne <shorne@gmail.com>
> Cc: Jonas Bonn <jonas@southpole.se>
> Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
> Cc: Stafford Horne <shorne@gmail.com>
> Cc: openrisc@lists.librecores.org
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>
> ---
> v5->v6:
> Remove the special handling in iounmap() because no page is got from
> fixmap pool along with early ioremap code removing in ioremap() - Mike.
>
> arch/openrisc/mm/ioremap.c | 43 +++++---------------------------------
> 1 file changed, 5 insertions(+), 38 deletions(-)
>
> diff --git a/arch/openrisc/mm/ioremap.c b/arch/openrisc/mm/ioremap.c
> index 8ec0dafecf25..cdbcc7e73684 100644
> --- a/arch/openrisc/mm/ioremap.c
> +++ b/arch/openrisc/mm/ioremap.c
> @@ -22,8 +22,6 @@
>
> extern int mem_init_done;
>
> -static unsigned int fixmaps_used __initdata;
> -
> /*
> * Remap an arbitrary physical address space into the kernel virtual
> * address space. Needed when the kernel wants to access high addresses
> @@ -52,24 +50,14 @@ void __iomem *__ref ioremap(phys_addr_t addr, unsigned long size)
> p = addr & PAGE_MASK;
> size = PAGE_ALIGN(last_addr + 1) - p;
>
> - if (likely(mem_init_done)) {
> - area = get_vm_area(size, VM_IOREMAP);
> - if (!area)
> - return NULL;
> - v = (unsigned long)area->addr;
> - } else {
> - if ((fixmaps_used + (size >> PAGE_SHIFT)) > FIX_N_IOREMAPS)
> - return NULL;
> - v = fix_to_virt(FIX_IOREMAP_BEGIN + fixmaps_used);
> - fixmaps_used += (size >> PAGE_SHIFT);
> - }
> + area = get_vm_area(size, VM_IOREMAP);
> + if (!area)
> + return NULL;
> + v = (unsigned long)area->addr;
>
> if (ioremap_page_range(v, v + size, p,
> __pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_CI))) {
> - if (likely(mem_init_done))
> - vfree(area->addr);
> - else
> - fixmaps_used -= (size >> PAGE_SHIFT);
> + vfree(area->addr);
> return NULL;
> }
>
> @@ -79,27 +67,6 @@ EXPORT_SYMBOL(ioremap);
>
> void iounmap(volatile void __iomem *addr)
> {
> - /* If the page is from the fixmap pool then we just clear out
> - * the fixmap mapping.
> - */
> - if (unlikely((unsigned long)addr > FIXADDR_START)) {
> - /* This is a bit broken... we don't really know
> - * how big the area is so it's difficult to know
> - * how many fixed pages to invalidate...
> - * just flush tlb and hope for the best...
> - * consider this a FIXME
> - *
> - * Really we should be clearing out one or more page
> - * table entries for these virtual addresses so that
> - * future references cause a page fault... for now, we
> - * rely on two things:
> - * i) this code never gets called on known boards
> - * ii) invalid accesses to the freed areas aren't made
> - */
> - flush_tlb_all();
> - return;
> - }
> -
> return vfree((void *)(PAGE_MASK & (unsigned long)addr));
> }
> EXPORT_SYMBOL(iounmap);
> --
> 2.34.1
>
--
Sincerely yours,
Mike.
next prev parent reply other threads:[~2023-06-11 5:45 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-09 7:55 [PATCH v6 00/19] mm: ioremap: Convert architectures to take GENERIC_IOREMAP way Baoquan He
2023-06-09 7:55 ` [PATCH v6 01/19] asm-generic/iomap.h: remove ARCH_HAS_IOREMAP_xx macros Baoquan He
2023-06-09 7:55 ` [PATCH v6 02/19] hexagon: mm: Convert to GENERIC_IOREMAP Baoquan He
2023-06-09 11:09 ` kernel test robot
2023-06-10 8:26 ` Baoquan He
2023-06-11 5:40 ` Mike Rapoport
2023-06-11 7:57 ` Baoquan He
2023-06-12 16:02 ` Nathan Chancellor
2023-06-16 12:46 ` Baoquan He
2023-06-09 7:55 ` [PATCH v6 03/19] openrisc: mm: remove unneeded early ioremap code Baoquan He
2023-06-10 6:24 ` Christoph Hellwig
2023-06-11 5:44 ` Mike Rapoport [this message]
2023-06-09 7:55 ` [PATCH v6 04/19] mm/ioremap: Define generic_ioremap_prot() and generic_iounmap() Baoquan He
2023-06-10 6:24 ` Christoph Hellwig
2023-06-09 7:55 ` [PATCH v6 05/19] mm: ioremap: allow ARCH to have its own ioremap method definition Baoquan He
2023-06-09 7:55 ` [PATCH v6 06/19] mm/ioremap: add slab availability checking in ioremap_prot Baoquan He
2023-06-09 7:55 ` [PATCH v6 07/19] arc: mm: Convert to GENERIC_IOREMAP Baoquan He
2023-06-09 7:55 ` [PATCH v6 08/19] ia64: " Baoquan He
2023-06-09 7:55 ` [PATCH v6 09/19] openrisc: " Baoquan He
2023-06-10 6:25 ` Christoph Hellwig
2023-06-11 5:46 ` Mike Rapoport
2023-06-09 7:55 ` [PATCH v6 10/19] s390: " Baoquan He
2023-06-09 15:41 ` kernel test robot
2023-06-09 17:42 ` kernel test robot
2023-06-09 17:42 ` kernel test robot
2023-06-11 11:10 ` Baoquan He
2023-06-21 14:53 ` Alexander Gordeev
2023-06-09 7:55 ` [PATCH v6 11/19] sh: add <asm-generic/io.h> including Baoquan He
2023-06-09 8:10 ` John Paul Adrian Glaubitz
2023-06-09 8:34 ` Baoquan He
2023-06-09 7:55 ` [PATCH v6 12/19] sh: mm: Convert to GENERIC_IOREMAP Baoquan He
2023-06-09 7:55 ` [PATCH v6 13/19] xtensa: " Baoquan He
2023-06-09 7:55 ` [PATCH v6 14/19] parisc: " Baoquan He
2023-06-19 5:47 ` Helge Deller
2023-06-09 7:55 ` [PATCH v6 15/19] mm/ioremap: Consider IOREMAP space in generic ioremap Baoquan He
2023-06-10 6:26 ` Christoph Hellwig
2023-06-09 7:55 ` [PATCH v6 16/19] mm: move is_ioremap_addr() into new header file Baoquan He
2023-06-09 7:55 ` [PATCH v6 17/19] powerpc: mm: Convert to GENERIC_IOREMAP Baoquan He
2023-06-09 7:55 ` [PATCH v6 18/19] arm64 : mm: add wrapper function ioremap_prot() Baoquan He
2023-06-14 15:14 ` Catalin Marinas
2023-06-09 7:55 ` [PATCH v6 19/19] mm: ioremap: remove unneeded ioremap_allowed and iounmap_allowed Baoquan He
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