lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Date:	Wed, 19 Dec 2012 02:22:11 -0500
From:	Paul Thompson <set.mailinglist@...il.com>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: SPARSE_IRQ

	Hi;

	Perhaps Im being an idiot, but it looks to me like the
menu-item for SPARSE_IRQ (under General setup -> IRQ subsystem)
depends solely on MAY_HAVE_SPARSE_IRQ, but I only see *one* user
for that in the kernel now, the SuperH arch (arch/sh/Kconfig). It
looks like everyone else explicitly sets SPARSE_IRQ. However the
menu-items description implies it is a more generic option...
	It seems like this menu item used to appear, in a forced
on state, then this condition made it disapear, leaving a blank
IRQ subsystem menu for me. I was trying to work around that, but
now, I am not sure exactly what is supposed to be going on here...

Paul

(from kernel/irq/Kconfig)
config SPARSE_IRQ
        bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ
        ---help---

          Sparse irq numbering is useful for distro kernels that want
          to define a high CONFIG_NR_CPUS value but still want to have
          low kernel memory footprint on smaller machines.

          ( Sparse irqs can also be beneficial on NUMA boxes, as they spread
            out the interrupt descriptors in a more NUMA-friendly way. )

          If you don't know what to do here, say N.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists