Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1293264

Re: [PATCH 01/11] resource: Add System RAM resource type

Show all headers | View raw

On Wed, Dec 16, 2015 at 09:52:37AM -0800, Dan Williams wrote:
> It's possible that as far as the resource table is concerned the
> resource type might just be "reserved".  It may not be until after a
> driver loads that we discover the memory range type.  The identifying
> string is driver specific at that point.

So how many types are we talking about here? Because I don't find a whole lot:

$ git grep -E "(walk_iomem_res|find_next_iomem_res|region_intersects)" -- *.c | grep -Eo '\".*\"'
"GART"
"ACPI Tables"
"ACPI Non-volatile Storage"
"Crash kernel"
"System RAM"
"System RAM"
"System RAM"

An int type could contain 2^32 different types.

> All this to say that with strcmp we can search for any custom type .
> Otherwise I think we're looking at updating the request_region()
> interface to take a type parameter.  That makes strcmp capability more
> attractive compared to updating a potentially large number of
> request_region() call sites.

Right, but I don't think that @name param to request_region() was ever
meant to be mis-used as a matching attribute when iterating over the
resource types.

Now, imagine you have to do this pretty often. Which is faster: a
strcmp() or an int comparison...?

Even if this cannot be changed easily/in one go, maybe we should at
least think about starting doing it right so that the strcmp() "fun" is
phased out gradually...

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH 01/11] resource: Add System RAM resource type Toshi Kani <toshi.kani@hpe.com> - 2015-12-15 00:40 +0100
  [PATCH 08/11] memremap: Change region_intersects() to use System RAM type Toshi Kani <toshi.kani@hpe.com> - 2015-12-15 00:40 +0100
  [PATCH 06/11] kexec: Set IORESOURCE_SYSTEM_RAM to System RAM Toshi Kani <toshi.kani@hpe.com> - 2015-12-15 00:40 +0100
  [PATCH 10/11] arm/samsung: Change s3c_pm_run_res() to use System RAM type Toshi Kani <toshi.kani@hpe.com> - 2015-12-15 00:40 +0100
    Re: [PATCH 10/11] arm/samsung: Change s3c_pm_run_res() to use System  RAM type Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2015-12-15 01:30 +0100
  [PATCH 07/11] memory-hotplug: Set IORESOURCE_SYSTEM_RAM to System RAM Toshi Kani <toshi.kani@hpe.com> - 2015-12-15 00:40 +0100
  [PATCH 04/11] arch: Set IORESOURCE_SYSTEM_RAM to System RAM Toshi Kani <toshi.kani@hpe.com> - 2015-12-15 00:40 +0100
  [PATCH 09/11] resource: Change walk_system_ram to use System RAM type Toshi Kani <toshi.kani@hpe.com> - 2015-12-15 00:40 +0100
  [PATCH 05/11] xen: Set IORESOURCE_SYSTEM_RAM to System RAM Toshi Kani <toshi.kani@hpe.com> - 2015-12-15 00:50 +0100
  [PATCH 03/11] x86/e820: Set IORESOURCE_SYSTEM_RAM to System RAM Toshi Kani <toshi.kani@hpe.com> - 2015-12-15 00:50 +0100
  Re: [PATCH 01/11] resource: Add System RAM resource type Borislav Petkov <bp@alien8.de> - 2015-12-16 13:30 +0100
    Re: [PATCH 01/11] resource: Add System RAM resource type Toshi Kani <toshi.kani@hpe.com> - 2015-12-16 16:50 +0100
      Re: [PATCH 01/11] resource: Add System RAM resource type Borislav Petkov <bp@alien8.de> - 2015-12-16 16:50 +0100
        Re: [PATCH 01/11] resource: Add System RAM resource type Toshi Kani <toshi.kani@hpe.com> - 2015-12-16 17:40 +0100
          Re: [PATCH 01/11] resource: Add System RAM resource type Borislav Petkov <bp@alien8.de> - 2015-12-16 18:50 +0100
            Re: [PATCH 01/11] resource: Add System RAM resource type Dan Williams <dan.j.williams@intel.com> - 2015-12-16 19:00 +0100
              Re: [PATCH 01/11] resource: Add System RAM resource type Borislav Petkov <bp@alien8.de> - 2015-12-16 19:20 +0100
                Re: [PATCH 01/11] resource: Add System RAM resource type Dan Williams <dan.j.williams@intel.com> - 2015-12-16 20:00 +0100
                Re: [PATCH 01/11] resource: Add System RAM resource type Borislav Petkov <bp@alien8.de> - 2015-12-16 20:20 +0100
                Re: [PATCH 01/11] resource: Add System RAM resource type Toshi Kani <toshi.kani@hpe.com> - 2015-12-16 23:00 +0100
                Re: [PATCH 01/11] resource: Add System RAM resource type Borislav Petkov <bp@alien8.de> - 2015-12-22 12:40 +0100
                Re: [PATCH 01/11] resource: Add System RAM resource type Toshi Kani <toshi.kani@hpe.com> - 2015-12-22 21:10 +0100
                Re: [PATCH 01/11] resource: Add System RAM resource type Borislav Petkov <bp@alien8.de> - 2015-12-23 15:30 +0100
                Re: [PATCH 01/11] resource: Add System RAM resource type Toshi Kani <toshi.kani@hpe.com> - 2015-12-24 03:30 +0100
                Re: [PATCH 01/11] resource: Add System RAM resource type Toshi Kani <toshi.kani@hpe.com> - 2015-12-24 18:10 +0100
                Re: [PATCH 01/11] resource: Add System RAM resource type Borislav Petkov <bp@alien8.de> - 2015-12-24 21:00 +0100
                Re: [PATCH 01/11] resource: Add System RAM resource type Toshi Kani <toshi.kani@hpe.com> - 2015-12-24 22:40 +0100

csiph-web