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6dde3569b8
linux/drivers/misc
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Douglas Anderson 6dde3569b8 lkdtm/bugs: Adjust lkdtm_HUNG_TASK() to avoid tail call optimization 
When testing with lkdtm_HUNG_TASK() and looking at the output, I
expected to see lkdtm_HUNG_TASK() in the stack crawl but it wasn't
there. Instead, the top function on at least some devices was
schedule() due to tail call optimization.

Let's do two things to help here:
1. We'll mark this as "__noreturn". On GCC at least this is documented
   to prevent tail call optimization. The docs [1] say "In order to
   preserve backtraces, GCC will never turn calls to noreturn
   functions into tail calls."
2. We'll add a BUG_ON(1) at the end which means that schedule() is no
   longer a tail call. Note that this is potentially important because
   if we _did_ end up returning from schedule() due to some weird
   issue then we'd potentially be violating the "noreturn" that we
   told the compiler about. BUG is the right thing to do here.

[1] https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20240122164935.2.I26e8f68c312824fcc80c19d4e91de2d2bef958f0@changeid
Signed-off-by: Kees Cook <keescook@chromium.org>
2024-02-01 09:44:07 -08:00
..
altera-stapl misc: add HAS_IOPORT dependencies 2023-05-29 15:05:00 +01:00
bcm-vk tty: bcm: convert to u8 and size_t 2023-12-08 12:02:37 +01:00
c2port c2port: replace deprecated strncpy with strscpy 2023-10-05 13:34:05 +02:00
cardreader misc: rtsx: add to support new card reader rts5264 2023-12-15 17:27:04 +01:00
cb710
cxl powerpc: Add PVN support for HeXin C2000 processor 2023-12-01 21:15:33 +11:00
echo
eeprom This cycle, I2C removes the currently unused CLASS_DDC support 2024-01-18 17:29:01 -08:00
genwqe mm, treewide: rename MAX_ORDER to MAX_PAGE_ORDER 2024-01-08 15:27:15 -08:00
ibmasm ibmasm: convert to new timestamp accessors 2023-10-18 13:26:16 +02:00
lis3lv02d misc: lis3lv02d_i2c: Add missing setting of the reg_ctrl callback 2024-01-04 17:01:14 +01:00
lkdtm lkdtm/bugs: Adjust lkdtm_HUNG_TASK() to avoid tail call optimization 2024-02-01 09:44:07 -08:00
mchp_pci1xxxx misc: microchip: pci1xxxx: Fix some NULL vs IS_ERR() bugs 2023-08-12 12:58:56 +02:00
mei mei: rework Kconfig dependencies 2023-12-15 17:02:15 +01:00
ocxl powerpc updates for 6.8 2024-01-08 16:22:47 -08:00
pvpanic pvpanic: Kill duplicate PCI_VENDOR_ID_REDHAT definition 2024-01-04 17:01:14 +01:00
sgi-gru arch: Remove Itanium (IA-64) architecture 2023-09-11 08:13:17 +00:00
sgi-xp sysctl-6.7-rc1 2023-11-01 20:51:41 -10:00
ti-st drivers: misc: ti-st: replace deprecated strncpy with strscpy 2023-10-05 13:34:04 +02:00
uacce uacce: make uacce_class constant 2023-10-27 08:51:00 +02:00
vmw_vmci Char/Misc and other Driver changes for 6.8-rc1 2024-01-17 16:47:17 -08:00
ad525x_dpot-i2c.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
ad525x_dpot-spi.c
ad525x_dpot.c
ad525x_dpot.h
apds990x.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
apds9802als.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
atmel-ssc.c misc: atmel-ssc: Use devm_platform_get_and_ioremap_resource() 2023-08-04 15:38:45 +02:00
bh1770glc.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
cs5535-mfgpt.c
ds1682.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
dummy-irq.c
dw-xdata-pcie.c dw-xdata: Remove usage of the deprecated ida_simple_*() API 2023-12-31 11:09:26 +00:00
enclosure.c drivers: remove struct module * setting from struct class 2023-03-17 15:16:27 +01:00
fastrpc.c misc: fastrpc: Unmap only if buffer is unmapped from DSP 2023-10-16 20:58:50 +02:00
gehc-achc.c
hi6421v600-irq.c misc: hi6421-spmi-pmic: Remove redundant dev_err() 2023-08-04 15:39:10 +02:00
hisi_hikey_usb.c
hmc6352.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
hpilo.c misc: hpilo: make ilo_class a static const structure 2023-08-11 21:41:36 +02:00
hpilo.h
ibmvmc.c Char/Misc and other driver changes for 6.7-rc1 2023-11-03 14:51:08 -10:00
ibmvmc.h
ics932s401.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
isl29003.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
isl29020.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
Kconfig misc: nsm: remove selecting the non-existing config CBOR 2023-12-15 17:07:41 +01:00
kgdbts.c
lattice-ecp3-config.c
Makefile misc: Add Nitro Secure Module driver 2023-11-28 19:05:16 +00:00
nsm.c misc: Add Nitro Secure Module driver 2023-11-28 19:05:16 +00:00
open-dice.c mm: replace vma->vm_flags direct modifications with modifier calls 2023-02-09 16:51:39 -08:00
pch_phub.c
pci_endpoint_test.c Merge branch 'pci/misc' 2024-01-15 12:10:41 -06:00
phantom.c misc: phantom: make phantom_class constant 2023-10-25 11:07:11 +02:00
qcom-coincell.c misc: Explicitly include correct DT includes 2023-08-04 15:39:04 +02:00
smpro-errmon.c misc: smpro-errmon: Remove the unneeded include <linux/i2c.h> 2023-05-31 19:00:10 +01:00
smpro-misc.c
sram-exec.c mm: Introduce set_memory_rox() 2022-12-15 10:37:26 -08:00
sram.c misc: Explicitly include correct DT includes 2023-08-04 15:39:04 +02:00
sram.h misc: sram: Improve and simplify clk handling 2023-03-09 17:31:53 +01:00
tifm_7xx1.c
tifm_core.c driver core: make struct bus_type.uevent() take a const * 2023-01-27 13:45:52 +01:00
tps6594-esm.c Merge 6.5-rc6 into char-misc-next 2023-08-13 22:14:51 +02:00
tps6594-pfsm.c misc: tps6594: Remove redundant dev_err_probe() for platform_get_irq_byname() 2023-08-12 12:58:40 +02:00
tsl2550.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
vcpu_stall_detector.c misc: Explicitly include correct DT includes 2023-08-04 15:39:04 +02:00
vmw_balloon.c vmw_balloon: dynamically allocate the vmw-balloon shrinker 2023-10-04 10:32:25 -07:00
xilinx_sdfec.c misc: Explicitly include correct DT includes 2023-08-04 15:39:04 +02:00
xilinx_tmr_inject.c misc: Explicitly include correct DT includes 2023-08-04 15:39:04 +02:00
xilinx_tmr_manager.c misc: Explicitly include correct DT includes 2023-08-04 15:39:04 +02:00